Composition for repairing scored cylinders.



L. LORENTOWICZ. OMPOSITION FOR REPAIRING SCORED CYLINDERS.

APPucn'mu mm mm: Ia. ms.

Patented Sept. 4, 1917.

3mm Leonard Loren towicj,

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Sept. 4, 1917.

I Application fled June 18, 1916. Serial No. 1l)8,453.

To all whom it ma concern:

Be it known t at I, LEONARD LonENTowlcz, a citizen of the United States, residing at Irvington, county of Essex, State of New Jersey, United States, haveinvented certain new and useful Improvements in Compositions for Repairing Scored Cylinders, of which the following is a specification, reference being had therein to the accompanying drawing.

The invention relates to improvements in compositions for renewing and repairing worn metal surfaces, and more particularly for filling of scores and the like occurring in engine cylinders, principally the cylinders of internal combustion engines.

It is well known that a great many cylinders of internal combustion engines are damaged by wear and very often they are scored to a considerable extent by foreign matter getting into the.oy1inder,or by parts of the apparatus becoming disarranged and scratching or gen g the interior of the cylinder wall so t at there is no tight fit between the piston and the cylinder, and this of course prevents maximum compression, and the engine soon becomes useless, or its efliciency very greatly impaired. The scoring is very often done by reason of a wrist pin coming loose and being carried along by. the piston in a manner to scrape the interior wall of the cylinder, so that it becomes chan 1 neled or scored.

It has heretofore been the practice to repair scored cylinders by grindingor rebormg them, and this is a very slow method and is expensive because of the time required for the purpose, and such manner of repairin necessitates the use of a new size piston an ring. Another method has been to weld the scored parts to the cylinder, but in subjecting the cylinder to a weldin heat, the same becomes warped, and there ore, in the ma- 'ority of instances, requires din or reoring, and a second disturbing of t e contour ofthe inside of the c linder wall.

The main object of t e invention is to. provide a composition for the purpose, and one which, while being easily and readily a plied to, or incorporated in,'the part of t e surface to be repaired, is of a nature to withstand; the maximum temperatures to which it may be sub"ected, and which are common to engine cylinders in theii opera- -5 tion.

With these other object? view, the

invention resides in the certain new and useful composition to be hereinafter more fully described, set forth in the appended claims, and the manner of its application illustrated in the accompanying drawings, in which Figure 1 is a fragmenta top view of a conventional form of ey inder showing 7 scores occurring in the inner surface of the of the cylinder.

In producing the composition of the present invention, I use block-tin alone, or in Y combination with either or both of thefollowing metals, namely, silver, copper, depending upon the type of engine cylmder, or other metal surface, it isdesired to repair, some of such surfaces being subjected to greater temperatures than are others, as in the case of air or water-cooled cylinders, the surface of the cylinder is heated to a lesser degree than is a cylinder not rovided with a cooling medium, so" that t e several in gradients may be varied to produce a composition filling of a desired or predetermined melting point. However, it has been determined that the block-tin maybe used alone, in some instances, and its melting point is to be increased or decreased, as ma be desired, by adding thereto either or both of the other metals mentioned, and, preferabl 'in a proportion of one-half per cent,

. or mm one half to one per cent. of the latter the composition, in the proportions above stated, it is to b'jfiunderstood that I do not spiicifically, limit myself thereto, as slight variations will not' seriously interfere wlth the efficiency of thdcompos'ition, and are to" be considered within the scope of the present invention.

"To illustrate the application of the desired composition, reference bein had to the drawin in which is shown t e conventional form 0 cylinder A with an inner wall and an outer wall 0 forming between them, a water space D through which water is circulated to keep the cylinder cool under running conditions, this water being supplied by the usual water circulating system with which all water cooled en 'nes are equipped and which is understood y those skilled 1n the art, and for that reason is not explained in detail here. The face E, of the inner wall B, is in contact with the piston or packing rings of the (piston which 0 erate within the cylinder, an it frequently appens that this wall E becomes scored in different ways, and very often by the ends of a wrist pin which comes loose and such scoring is shown at F in Fig. 1. This scoring is sometimes quite extensive, and such extensive scoring is shown in Figs. 1 and 2. f the old method of welding is resorted to, t e. cylinder is subjected to a high heat which very often warps 1t, and the cylinder then requires reboring, and I have devised means and method for filling the scored parts without the applica tion of a high heat, such as is necessary in Y the welding process.

After thoroughl cleaning the surface of a score in the meta surface, by scraping the same lightly to remove the top grease and dirt therefrom, and until the'same brightens to a shiny finish, a suitable flux is applied, and then the". score is filled with the composition, in either molten or solid state, and is then thoroughly amal ated, or. otherwise incorporated in position, and is finished flush with the contour of the surface, by means of a suitable tool, scraper or special machine (not shown). In the ap lication of the composition, a suitably heate soldeslfij ing iron, or a small torch is used to furni just suflicient heat is keep the same in thoroughly melted or' workable state, with;

out any undue heatin of the surroundin surface, and, in some nstances, it is desired that the surfaces of a score be prepared with a thin coating of tin, to insure the adherence of a relative y hard alloy or composition thereto.

In an case, the invention provides for a metallic composition havin a high melting point so that it is not a ected after it is p aced in the cylinder, by the degree of heat generated by the combustion of the fuel in, the enginecylinder. I have found that a very good metal for this purpose is.

block-tin, and this is to be further hardened, when desired, by the addition of from onehalf to one per cent. of either or both of the other metals hereinbefore mentioned.

The drawing in Fig. 2 shows the scored parts F filled with the metal G. The metal is put into the grooves, and is then scraped, with a scraper or similar tool, or special machine devised for the purpose, (not shown), shaped to the contour of the cylinder wall so that it is substantially concentric and flush with the surface E of the cylinder. It is usual to first apply to the cleaned surface of a score a suitable flux so that the metal attaches itself well to the metal of the cylinder, such flux consisting of acid and salammoniac, or any other of the usual fluxes that are used in soldering operations.

In Fig. 3 I have shown the cylinder wall B provided on its face E with grooves H, which are shown small in proportion to the thickness of the wall of the cylinder, being virtually small scratches. When these scratches occur and it is desired to fill them with metal, I deepen the scratches, that is, I score them to a greater extent so that a larger area is presented for the fastening of the metal G, whichmetal is shown in Fig. 4, after it is applied to the scratches H, which have been deepened, as shown at I in said Fig. 4. I have found that this metal,

when applied and reduced to the contour of the wall of the cylinder, forms a smooth surface, and cylinders so treated have given long service without any leaking between the piston and the cylinder. The metal is of a high elting point so that the running of the engine does not furnish enough heat to cause the filling to melt, and this is particularly true, in the ase. of a water cooled on no.

aving thus fully described the invention, what I claim, is

A composition for repairing scored metallic surfaces adapted to be subjected to relatively high temperatures, which consists of block tin, silver and copper, substantially in the proportions describe y In testimony whereof I aflix my signature in the presence of two witnesses.

' LEONARD LORENTOWICZ.

.Witnesses:

" RICHARD E. SMITH, Jr.,

Roam Gamma; I 

